package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.ResolveDatabaseTableIdSelfGrowingFailureConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.*;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

/**
 * @Author BUPT-Dingchang
 * @Create 2024/3/4 15:20
 * ClassName: DishServiceImpl
 * Description:
 */

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    @Autowired
    private ResolveIdSelfGrowingFailureMapper resolveIdSelfGrowingFailureMapper;

    @Autowired
    private SetmealMapper setmealMapper;



    /**
     * 新增菜品和对应的口味
     * @param dishDTO
     * @Transactional 保证原子性
     */
    @Transactional(rollbackFor = Exception.class)
    @Override
    public void addDishWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        // 向菜品表插入一条数据
        resolveIdSelfGrowingFailureMapper.resolveIdSelfGrowingFailureMapper(ResolveDatabaseTableIdSelfGrowingFailureConstant.DISH);
        dishMapper.insert(dish);

        Long id = dish.getId();

        // 向菜品口味表插入数据
        List<DishFlavor>flavors = dishDTO.getFlavors();
        if(flavors != null && !flavors.isEmpty()) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(id);
            });

            // 向口味表插入n条数据
            resolveIdSelfGrowingFailureMapper.resolveIdSelfGrowingFailureMapper(ResolveDatabaseTableIdSelfGrowingFailureConstant.DISH_FLAVOR);
            dishFlavorMapper.insertBatch(flavors);
        }

    }


    /**
     * 菜品分页查询
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());
    }


    /**
     * 菜品批量删除
     * @param ids
     */
    @Override
    @Transactional(rollbackFor = Exception.class)
    public void deleteBatch(List<Long> ids) {
        // 判断当前菜品是否能删除：是否存在起售中的菜品
        for(Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if(dish.getStatus().equals(StatusConstant.ENABLE)) {
                // 商品起售中
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

        // 判断当前菜品是否能删除：是否被套餐关联·
        List<Long> setmealIdsDishIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if (setmealIdsDishIds!=null && !setmealIdsDishIds.isEmpty()){
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        //// 删除菜品表中的菜品数据
        //for (Long id : ids) {
        //    dishMapper.deleteById(id);
        //    //删除菜品关联的口味数据
        //    dishFlavorMapper.deleteByDishId(id);
        //}

        // 修改代码，减少SQL语句。SQL改为:delete from dish where id in (?,?,?,?)

        // 根据菜品id批量删除菜品表中的菜品数据
        dishMapper.deleteByIds(ids);

        // 根据菜品id批量删除关联的口味数据
        dishFlavorMapper.deleteByDishIds(ids);

    }


    /**
     * 根据id查询菜品和口味数据
     * @param id
     * @return
     */
    @Override
    public DishVO getDishByIdWithFlavor(Long id) {
        // 根据id查询菜品数据
        Dish dish = dishMapper.getById(id);

        // 根据菜品id查询口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);

        // 将查询到的数据封装到VO对象
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(dishFlavors);

        return dishVO;
    }


    /**
     * 根据id修改基本的菜品信息和口味信息
     * @param dishDTO
     */
    @Override
    @Transactional(rollbackFor = Exception.class)
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        // 修改菜品基本信息
        dishMapper.update(dish);
        // 删除原有口味数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        // 重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null && !flavors.isEmpty()) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });

            resolveIdSelfGrowingFailureMapper.resolveIdSelfGrowingFailureMapper(ResolveDatabaseTableIdSelfGrowingFailureConstant.DISH_FLAVOR);
            // 向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }

    }


    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> listDishByCategoryId(Long categoryId) {
        return dishMapper.listDishByCategoryId(categoryId);
    }


    /**
     * 菜品起售/停售
     * @param status
     * @param id
     */
    @Override
    public void updateStatus(Integer status, Long id) {
        dishMapper.update(Dish.builder()
                .id(id)
                .status(status)
                .build()
        );

        if(status.equals(StatusConstant.DISABLE)) {
            // 如果是停售操作，还需要将包含当前菜品的套餐也停售
            List<Long> dishIds = new ArrayList<>();
            dishIds.add(id);
            // select setmeal_id from setmeal_dish where dish_id in (?,?,?)
            List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(dishIds);
            if(setmealIds != null && !setmealIds.isEmpty()) {
                for(Long setmealId : setmealIds) {
                    setmealMapper.update(
                            Setmeal.builder()
                                    .id(setmealId)
                                    .status(StatusConstant.DISABLE)
                                    .build()
                    );
                }
            }
        }

    }

    @Override
    public List<DishVO> listWithFlavor(Dish dish) {

        List<Dish> dishList = dishMapper.list(dish);
        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            // 根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());
            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }
        return dishVOList;
    }

    //@Override
    //public List<Dish> list(Long categoryId) {
    //    Dish dish = Dish.builder()
    //    .categoryId(categoryId)
    //    .status(StatusConstant.ENABLE)
    //    .build();
    //return dishMapper.list(dish);
    //}

}
